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Related Experiment Videos

Alternative genetic pathways in colorectal carcinogenesis

S Olschwang1, R Hamelin, P Laurent-Puig

  • 1Institut National de la Santé et de la Recherche Médicale U434, Centre d'Etude du Polymorphisme Humain, 27 rue Juliette Dodu, 75010 Paris, France.

Proceedings of the National Academy of Sciences of the United States of America
|October 29, 1997
PubMed
Summary

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Replication errors (RERs) in colorectal cancer DNA show a bimodal distribution. This study differentiates RER- and RER+ subtypes, revealing distinct gene alteration patterns in these colorectal cancer groups.

Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Microsatellite instability, indicated by replication errors (RERs), is a known feature in a subtype of colorectal cancer.
  • A deficiency in DNA mismatch repair is associated with a high incidence of RERs.
  • The precise frequency and implications of RERs in a consecutive series of colorectal tumors required further investigation.

Purpose of the Study:

  • To analyze the frequency of RERs at microsatellite loci in a series of colorectal tumors.
  • To develop a statistical method for distinguishing between RER-negative (RER-) and RER-positive (RER+) colorectal cancer subtypes.
  • To compare gene mutation profiles, including K-ras, p53, and APC, between RER- and RER+ colorectal tumors.

Main Methods:

  • Comparative typing of matched tumor and blood DNA at dinucleotide repeat (microsatellite) loci.

Related Experiment Videos

  • Analysis of 88 colorectal tumors to determine RER frequency.
  • Development and application of a statistical test for operational discrimination between RER- and RER+ subtypes.
  • Assessment of K-ras, p53, and APC gene mutation frequencies.

    • Main Results:

    • A bimodal distribution of RER frequency was observed in 88 colorectal tumors.
    • The RER- subtype comprised 75 tumors, with a locus instability probability of 0.02.
    • A statistical test achieved a misclassification probability below 0.001 for differentiating RER- and RER+ subtypes.
    • K-ras mutation frequency was similar in both subtypes.
    • RER+ tumors showed less frequent p53 mutations and rare APC mutations, with no biallelic inactivation observed for these genes.

    Conclusions:

    • Colorectal tumors exhibit a bimodal RER frequency, allowing for subtype discrimination.
    • The RER+ subtype is characterized by distinct genetic alteration patterns compared to the RER- subtype.
    • The repertoires of frequently altered genes in RER+ and RER- colorectal tumors appear to differ significantly.